<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<input id="text" type="text" />
<button onclick="send()">Send</button>
<button onclick="closeWebSocket()">Close</button>
<a href="/user/logOut" type="button">LogOut</a>
<div id="message"></div>

<script src="assets/jquery-2.1.4/jquery.min.js"></script>
<script>
    var href = document.location.href;

    var httpURL = getIPandPort(href);

    var wsURL = "ws://192.168.3.222:8080/websocket";

    var websocket = null;

    //判断当前浏览器是否支持WebSocket
    if('WebSocket' in window){
        websocket = new WebSocket(wsURL);
        alert(websocket.readyState);
    }
    else{
        alert('Not support websocket')
    }

    //连接发生错误的回调方法
    websocket.onerror = function(){
        setMessageInnerHTML("error");
    };

    //连接成功建立的回调方法
    websocket.onopen = function(event){
        setMessageInnerHTML("open");
    }

    //接收到消息的回调方法
    websocket.onmessage = function(event){
        setMessageInnerHTML(event.data);
    }

    //连接关闭的回调方法
    websocket.onclose = function(){
        setMessageInnerHTML("close");
    }

    //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
    window.onbeforeunload = function(){
        websocket.close();
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML){
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket(){
        websocket.close();
    }

    //发送消息
    function send(){
        var message = document.getElementById('text').value;
        websocket.send(message);
    }

    function getIPandPort(url)
    {
        var temp_url_1 = url.substring(7);
        if(temp_url_1.indexOf('/') > 0)
        {
            return temp_url_1.substring(0,temp_url_1.indexOf('/'));
        }
        return temp_url_1;
    }

</script>
</body>
</html>